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Thermodynamic constraints on a time-dependent Lambda model (cosmology)

J M Salim and I Waga

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The general expression for the entropy production in cosmologies with variable effective cosmological 'constant' ( Lambda ) is presented. By assuming that Lambda decays as Lambda = alpha R-m+ beta (R/R)2, where R(t) is the scale factor of the FRW models, the second law of thermodynamics and the Landau-Lifshitz theory for non-equilibrium fluctuations are used to establish constraints on the parameters alpha , beta and m.


PACS

05.70.Ce Thermodynamic functions and equations of state

98.80.Es Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)

04.20.-q Classical general relativity

MSC

83C05 Einstein's equations (general structure, canonical formalism, Cauchy problems)

83F05 Cosmology

Subjects

Gravitation and cosmology

Statistical physics and nonlinear systems

Astrophysics and astroparticles

Dates

Issue 9 (September 1993)



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